Abstract
Coprecipitation of lead chromate and barium chromate which have the same chemical formula, MCrO4, but belong to different crystal systems has been studied by treating an equimolar mixture of lead and barium solutions with chromic and bromate solutions at pH 4.5 to precipitate their chromates from a homogeneous solution.
Lead chromate less soluble than barium chromate precipitated predominantly, and a small quantity of barium coprecipitated. The logarithmic distribution law held for this coprecipitation system. The precipitated particles containing about 95% of lead and a few % of barium had the same morphological and crystallographic properties with pure lead chromate.
